78494964 has 12 divisors (see below), whose sum is σ = 183154944. Its totient is φ = 26164984.

The previous prime is 78494963. The next prime is 78494971. The reversal of 78494964 is 46949487.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×78494964² = 12322918746722592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78494963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3270612 + ... + 3270635.

It is an arithmetic number, because the mean of its divisors is an integer number (15262912).

Almost surely, 2^78494964 is an apocalyptic number.

It is an amenable number.

78494964 is an abundant number, since it is smaller than the sum of its proper divisors (104659980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78494964 is a wasteful number, since it uses less digits than its factorization.

78494964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6541254 (or 6541252 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 51.

The square root of 78494964 is about 8859.7383708550. The cubic root of 78494964 is about 428.1677291183.

The spelling of 78494964 in words is "seventy-eight million, four hundred ninety-four thousand, nine hundred sixty-four".